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  <title>2D内积运算</title>
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    <div class="kk">请输入：</div>
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      示例：<br>
      <b><i>a=(5,6)</i></b><br>
      <b><i>b=(1,6)</i></b>
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      <b><i>a</i></b> = (
      <input type="text" id="x1" name="x1" placeholder="x1">
      ,
      <input type="text" id="y1" name="y1" placeholder="y1">
      )
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    <div class="kk">
      <b><i>b</i></b> = (<input type="text" id="x2" name="x2" placeholder="x2">
      ,
      <input type="text" id="y2" name="y2" placeholder="y2"> )
    </div>

    <div class="kk"><i>c</i> = <b><i>a*b</i></b>=<i>b</i>*cos(<i>&theta;</i>)*<i>a</i></div>
    <div class="kk"> =
      <input type="text" id="result" class="result" readonly="true" name="result">
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